What am I?

I've been trying to identify this bird for a while but no luck. It doesn't come to the feeder, but it loves this nest-stuff. About six weeks ago he and his mate were hard at work, but we hadn't seen him for a long time until yesterday. It isn't the best picture, since there was a window between me and the bird, but beggers can't be choosers.




Speaking of bird stuff - River Rat sent me the coolest CD of Loon tunes. I've tried to send him email thanking him (twice now) but I'm not sure it's going through. So, a public shout-out to insure he receives my thanks.